Interface and Hardware Component Configuration Guide, Cisco IOS XE Release 3SE (Catalyst 3850 Switches)
Configuring Ethernet Management Port
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Configuring Ethernet Management Port

Configuring Ethernet Management Port

Finding Feature Information

Your software release may not support all the features documented in this module. For the latest feature information and caveats, see the release notes for your platform and software release.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to http:/​/​www.cisco.com/​go/​cfn. An account on Cisco.com is not required.

Prerequisites for Ethernet Management Ports

When connecting a PC to the Ethernet management port, you must first assign an IP address.

Information about the Ethernet Management Port

The Ethernet management port, also referred to as the Gi0/0 or GigabitEthernet0/0 port, is a VRF (VPN routing/forwarding) interface to which you can connect a PC. You can use the Ethernet management port instead of the switch console port for network management. When managing a switch stack, connect the PC to the Ethernet management port on a stack member.

Ethernet Management Port Direct Connection to a Switch

Figure 1. Connecting a Switch to a PC. This figure displays how to connect the Ethernet management port to the PC for a switch or a standalone switch.

Ethernet Management Port Connection to Stack Switches using a Hub

In a stack with only stack switches, all the Ethernet management ports on the stack members are connected to a hub to which the PC is connected. The active link is from the Ethernet management port on the active switchthrough the hub, to the PC. If the active switch fails and a new active switch is elected, the active link is now from the Ethernet management port on the new active switch to the PC.

Figure 2. Connecting a Switch Stack to a PC. This figure displays how a PC uses a hub to connect to a switch stack.

1 Switch stack 3 Hub
2 Management port 4 PC

Ethernet Management Port and Routing

By default, the Ethernet management port is enabled. The switch cannot route packets from the Ethernet management port to a network port, and the reverse. Even though the Ethernet management port does not support routing, you may need to enable routing protocols on the port.

Figure 3. Network Example with Routing Protocols Enabled. In the following figure, you must enable routing protocols on the Ethernet management port when the PC is multiple hops away from the switch and the packets must pass through multiple Layer 3 devices to reach the PC.

In the above figure , if the Ethernet management port and the network ports are associated with the same routing process, the routes are propagated as follows:

  • The routes from the Ethernet management port are propagated through the network ports to the network.
  • The routes from the network ports are propagated through the Ethernet management port to the network.

Because routing is not supported between the Ethernet management port and the network ports, traffic between these ports cannot be sent or received. If this happens, data packet loops occur between the ports, which disrupt the switch and network operation. To prevent the loops, configure route filters to avoid routes between the Ethernet management port and the network ports.

Supported Features on the Ethernet Management Port

The Ethernet management port supports these features:

  • Express Setup (only in switch stacks)
  • Network Assistant
  • Telnet with passwords
  • TFTP
  • Secure Shell (SSH)
  • DHCP-based autoconfiguration
  • SMNP (only the ENTITY-MIB and the IF-MIB)
  • IP ping
  • Interface features
    • Speed—10 Mb/s, 100 Mb/s, 1000 Mb/s, and autonegotiation
    • Duplex mode—Full, half, and autonegotiation
    • Loopback detection
  • Cisco Discovery Protocol (CDP)
  • DHCP relay agent
  • IPv4 and IPv6 access control lists (ACLs)
  • Routing protocols

Caution


Before enabling a feature on the Ethernet management port, make sure that the feature is supported. If you try to configure an unsupported feature on the Ethernet Management port, the feature might not work properly, and the switch might fail.


How to Configure the Ethernet Management Port

Disabling and Enabling the Ethernet Management Port

To disable or enable the Ethernet management port in the CLI, follow this procedure.

SUMMARY STEPS

    1.    configure terminal

    2.    interface gigabitethernet0/0

    3.    shutdown

    4.    no shutdown

    5.    exit

    6.    show interfaces gigabitethernet0/0


DETAILED STEPS
      Command or Action Purpose
    Step 1 configure terminal


    Example:
    Switch# configure terminal
     

    Enters global configuration mode.

     
    Step 2 interface gigabitethernet0/0


    Example:
    Switch(config)# interface gigabitethernet0/0
     

    Specifies the Ethernet management port in the CLI.

     
    Step 3 shutdown


    Example:
    Switch(config-if)# shutdown
     

    Disables the Ethernet management port.

     
    Step 4 no shutdown


    Example:
    Switch(config-if)# no shutdown
     

    Enables the Ethernet management port.

     
    Step 5 exit


    Example:
    Switch(config-if)# exit
     

    Exits interface configuration mode.

     
    Step 6 show interfaces gigabitethernet0/0


    Example:
    Switch# show interfaces gigabitethernet0/0
     

    Displays the link status.

    To find out the link status to the PC, you can monitor the LED for the Ethernet management port. The LED is green (on) when the link is active, and the LED is off when the link is down. The LED is amber when there is a POST failure.

     
    What to Do Next

    Proceed to manage or configure your switch using the Ethernet management port. Refer to the Network Management Configuration Guide (Catalyst 3850 Switches).

    Additional References

    Related Documents

    Related Topic Document Title
    Bootloader configuration

    System Management Configuration Guide (Catalyst 3850 Switches)

    Bootloader commands

    System Management Command Reference (Catalyst 3850 Switches)

    Error Message Decoder

    Description Link

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    https:/​/​www.cisco.com/​cgi-bin/​Support/​Errordecoder/​index.cgi

    MIBs

    MIB MIBs Link

    All supported MIBs for this release.

    To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use Cisco MIB Locator found at the following URL:

    http:/​/​www.cisco.com/​go/​mibs

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    Feature Information for Ethernet Management Ports

    Release

    Modification

    Cisco IOS XE 3.2SE

    This feature was introduced.